Process of treating fibers, &amp;c., to imitate silk.



UNITED STATEs PATENT OFFICE.

EDUARD UNGNAD, OF RIXDORF-BERLIN, GERMANY.

PROCESS OF TREATING FIBERS, 806., TO IMITATE SILK.

SPECIFICATION forming part Of Letters Patent No. 643,923, dttd. February20, 1900. Application filed August 10, 1898. Serial No. 588,252. (Nospecimens.)

To all whom it may concern.-

Be it known that I, EDUARD UNGNAD, chemist, of 52 J uliusstrasse,RiXdorf-Berlin, in the Empire of Germany, have invented new and useful-Improvements Relating to the Treatment of Fibers, Yarns, and Fabrics toImitate Silk, of which the following isa specification.

My invention relates to the treatment of fibers, yarns, and fabrics toimitate silk.

Silk is dissolved in an alkaline solution while heating. The fibers,yarns, or fabrics to be enriched are soaked in this solution, freed fromany excessive quantity of same, and then treated in a bath of alkalinebicarbonate in excess or hung in a large chamber through which gasescontaining carbonic acid-for instance, washed products of c0mbustionareconducted. The carbonic acid contained in the products of combustion orin the alkaline bicarbonate of the bath combines with the alkali of thesilk solution, converts it into an alkaline carbonate, therebydepositing the silk from its solution onto the fiber. After drying thesilk to the fiber the alkaline carbonate is lixiviated by warm water, aportion of same is rendered caustic again by the addition of lime, andthus serves for dissolving fresh quantities of silk, while the otherportion is converted by the passage of products of combustion intoalkaline bicarbonate, and, as hereinbefore stated, is used again as abath for the deposition of the silk on the fiber, or the solution ofbicarbonate is heated and carbonic acid expelled from it, which gas, asset forth, may likewise be employed for saturating the alkali andseparating the silk.

Having now described my invention, what I claim, and desire to secure byLetters Patent,

EDUARD UNGNADQ Vitnesses HENRY HASPER, O. H. DAY.

The improved process of treating vegetable

